Automatic screen cleaner



Oct. 21, 1930. w WEHMANN 1,779,348

' AUTOMATIC SCREEN CLEANER Filed March 22, 1930 Patented Oct. 21,1930 IV nueus'r w. warn/mun, OFBELLEVILLEQILLINOIQ AUTOMATIC mam CLEANER IApplication fiIed March 2 2, 1936; serial noh saisa,

This invention relates to new and useful improvements in automaticscreen cleaners and has for its primary object the provision of a deviceof the above stated character to prevent clogging of the screen employedfor grading or separating materials of different sizes such as coal,stones, graveh-sand, etc.

Another object of this invention is the provision of pivoted pendulumsto jar or vibrate 1n the screen durin the reciprocatory movement thereofto prevent the line grade of ma features of construction and arrangementof parts, as will be hereinafter morefully described and claimed. V 1

For acomplete understanding of'my invention reference is to be had tothe following description and accompanying drawing in which;

Figure 1 is a side eievation partly in section illustrating an automaticscreen cleaner constructed in accordance with my invention.

Figure 2 is an end elevation illustrating the same.

Referring in detail to the drawing, the numeral 1 indicates a screen ofa well known construction for separating materials of different sizesand which'is adapted to have the material pass thereover, and during thereciprocation of the screen the finer material to pass through openingsof thescreen, and thereby be separated or segregated from the coarsermaterial.

The material to be graded is fed over the screen 2, the materialofcertain sizes passing through the openings in the screen 2 on to thescreen 3 while the coarser material passes to a pile or container andthe material on the screen 3 is again separated, the finer passing on tothe bottom 4 while the second grade of m or containe rialspassing-through the openings in the screens 2 and 3 frequently clog theopenings and render the screens inefficient in their op eration, and toovercome this objection my invention is applied to the bottom 4t andoperates through openings 5 in said bottom to jar or Vibrate the screensduring their re ciprocatory motion to cause any material I clogging theopenings to pass therefrom.

A bracket 6 is secured to the bottom 4: of the screen 1 between theopenings 5 and carries the wrist pin 7 on which a pendulum 8 isournaled. The pendulum includes, a

aterial delivers into janother'pile 7 (from the bottom ,4. The mateshank 9, the upper end having an opening to receive the wrist pin andits lower portion provided with a series of openings 10 any one of whichis to receive a set screw 11 carried by a counter balance weight 12 topermit the weight to be adjusted relatively to the shank 9. A head 13 isformed on the shank 9 adjacent the pivoted end thereof, and includes apair of arcuate shaped arms 14 disposed in opposite directions from theshank 9 and extending through the openings 5 of the bottom 4. The head13 is substantially semi-circular in shape and during the reciprocationof the screen 1, the shank 9 is swung on the wrist pin 7 in a backwardand forward manner to cause the ends of the head 13 to strikethe screen3 and vibrate the latter to cause material that may clog the openings topass therefrom and thereby maintain the screen in'a condition toefficiently separate or grade the finer material. The counter-balanceweight 12 being adjustable on the shank 9 permits the force of the head13 against the screen to be varied if desired.

While I have shown and described the preferred embodiment of myinvention, it will be understood that minor changes in construction,combination and arrangement of parts may bemade without departing fromthe spirit and scope of the invention as claimed.

Having thus I claim is: I

An automatic screen cleaner including a' screening element and areciprocating frame 1 described myinvention what therefor having spacedslots in the bottom Wall, a bracket secured to the bottom Wall betweenthe slots a shank having one end pivoted to the bracket and providedWith spaced openings adjacent the other end thereof, a Weight slidableon said shank, a fastener carried by the Weight and adapted to extendinto any one of the openings, to adjustahly secure the Weight to theshank, and a pair of oppositely disposed arcuate shaped arms formedintegrally at one of their; endswith.

the shank adjacent the pivot and extending through the slots to permitthe other. endsthereof to alternately strike against the 1 screeningelement during thereciprocation of the frame.

In testimony whereof I affix my signature.

AUGUST W. VIEHMANN.

